Parametric Study Of Silo-material Interaction


The finite element program SAP IV was used to investigate a) the criticality of assumed design values of the modulus of elasticity and Poisson's ratio of the material in the static and flowing zones to the final design of circular concrete silos and b) the effect of material stiffness and of shear transfer at the material-wall interface on the horizontal bending moments and the hoop tension developed during eccentric discharge. Three models and two elevational cases were considered. Model 1 simulated full-shear transfer at the material-wall interface, Model 2 no-shear transfer, and Model 3 the sitffness of the silo wall only. The reinforcement for Models 1 and 2 was slightly less than that by ACI Standard 313-77 for the lower elevation and slightly greater for the higher. Model 3 was overly conservative. Lower bending moments accompanied an increase of the modulus of elasticity of the material in the flow channel; an increase in modulus of the material in the static region resulted in a decrease of bending moment for the two lower, of three, values of the flow modulus; and the bending moment was essentially insensitive to change of static modulus when coupled with the largest flow modulus. © 1983.


Civil, Architectural and Environmental Engineering

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Article - Journal

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Publication Date

01 Jan 1983